Machine for forming joining pipes

Abstract

The machine comprises a fixedly mounted holder maintaining the pipe in a position so that the end thereof which is to be formed extends in a horizontal plane. Two complementary or mating pins are insertable in this end of the pipe. Supporting and driving means are provided for moving the two pins in opposite directions for a distance corresponding to the deformation to be given to this end of the pipe.

I claim: 
     
       1. A machine for forming one end of a pipe to be particularly used for heat exchangers so as to exhibit a substantially oblong opening, said oblong opening having a major axis forming any angle with respect to the longitudinal axis of said pipe, the machine comprising a fixedly mounted holder maintaining the pipe on whole periphery thereof in a position in which the end of the pipe which is to be formed is free and extends in a horizontal plane; two complementary or mating shaping pins adapted to be inserted into said free end of the pipe only; and pin supporting and driving means from which said pins protrude for moving said two pins on a trajectory in opposite directions for a distance corresponding to the deformation to be given to said end of the pipe; the machine further comprising at least one fixed die placed opposite at least one of the pins on the trajectory thereof. 
     
     
       2. Machine as set forth in claim 1, wherein the pins are externally connected to two coaxially guided slides, cylinders with piston rods being connected to said slides and positionable outside of the pipe. 
     
     
       3. Machine as set forth in claim 2, wherein the pins are connected to the slide through intermediate parts, thereby facilitating the interchange thereof. 
     
     
       4. Machine as set forth in claim 1, wherein the pins have substantially vertical sides, whereby the portion formed in the end of the pipe has substantially vertical walls whatever be the angle of the longitudinal axis of the holder with the pins. 
     
     
       5. Machine as set forth in claim 1, wherein said fixedly mounted holder of the pipe is removably connected to a supporting block. 
     
     
       6. Machine as set forth in claim 1, in which a core is placed inside the pipe, the machine comprising two half-sockets surrounding said pipe on a portion of the height thereof and held inside said holder, whereby the pipe is completely maintained between the core and the two half sockets. 
     
     
       7. Machine as set forth in claim 6, wherein said core is centered in the two half-sockets placed in the holder by means of collars. 
     
     
       8. Machine for forming one end of a pipe for heat exchangers so as to exhibit a substantially oblong opening, said oblong opening having a major axis forming any angle with respect to the longitudinal axis of said pipe, the machine comprising a fixedly mounted holder maintaining the pipe in a position in which the end thereof which is to be formed extends in a horizontal plane; two complementary or mating pins adapted to be inserted into said end of the pipe; supporting and driving means for moving said two pins in opposite directions for a distance corresponding to the deformation to be given to said end of the pipe, and an adjustable support on which the holder is mounted, said support being movable about an arc of a circle centered on the longitudinal axis of the holder, whereby the forming of said end of the pipe is made in any angular direction. 
     
     
       9. Machine for forming one end of a small pipe for a heat exchanger so as to exhibit a substantially oblong opening, said oblong opening having a major axis forming any angle with respect to the longitudinal axis of said pipe, the machine comprising a fixedly mounted holder maintaining the pipe in a position in which the end thereof which is to be formed extends in a horizontal plane; two complementary or mating pins adapted to be inserted into said end of the pipe; two coaxially guided slides to which said pins are externally connected; cylinders with piston rods connected to said slides, said cylinders with piston rods being positionable outside the pipe; supporting and driving means for moving said two pins in opposite directions for a distance corresponding to the deformation to be given to said end of the pipe; and abutments adjustably mounted in front of said cylinders to restrict the movements of said pins to the deformation to be given to said end of the pipe.